2. Demi Lovato & Selena Gomez

These girls might just have one of the longest lasting friendships in Hollywood! The two Texas natives met as toddlers on the set of Barney. Recently, Selena performed on X Factor and the two caught up backstage. Selena posted an adorable photo on her Instagram with the caption: “It’s just the evidence of forever.” Her BFF replied by saying that they’re 14 years strong!